XJ XJ6 / XJ8 / XJR ( X350 & X358 ) 2003 - 2009

over heating experience

Old 05-17-2019, 05:07 PM
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Join Date: May 2018
Location: Columbus Ohio
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Default over heating experience

Hey All,
My 2005 super V8 started having an overheat problem on a recent two hour trip from columbus ohio to cleveland. If I kept the car below 70 the temp moderated a bit but even slight uphills made the temp go immediately to red. Somehow I limped home in cooler temperatures at night, but the same scenario existed. Over the next two weeks the low coolant warning came on, then finally, after taking it to my shop where a system flush and new coolant were done, I actually had coolant left on the garage floor after a short trip.

Took it again to my shop, where he identified an easy to reach bypass hose leaking. He changed it, but this did not solve the problem.The shop let the car idle for an hour, but when I drove it home it took only 15 minutes to overheat.

Back to the shop and further digging by taking the top off the engine showed where the problem was.

Since he had to take the top of the engine off and then had access to other things, he replaced 4 bypass hoses, the thermostat, engine gaskets, the o-rings on the fuel injectors, the fuel filter, and did another flush of the coolant system. I think he said there was another main hose under the engine that he replaced but not sure.

Anyway, for all this he charged me $500. The car is running really well, and as one might expect, has a bit more pep than before.

One interesting thing about all this was that he said the first bypass hose could only be sourced from Jaguar, and it too forever to arrive. Since I'm really patient with the process and trust the shop I go to, I think they cut me slack on the price of repairs. They are really good people even though they think my car is for an old lady.

Mike D.
2005 Super V8
Old 05-18-2019, 10:10 PM
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Your very lucky, from what i've read, it's often too late, when it goes into the red.
Old 05-19-2019, 08:01 PM
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Join Date: May 2018
Location: Columbus Ohio
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Wingrider -
Thanks for the reminder - I did my best not to push it, and as soon as red showed, I managed to find a way to keep the temperature below the danger zone. It could have been otherwise, or something more serious and disappointing like a head gasket.

I am also lucky in that a non-wrencher like me has a reasonable and experienced mechanic to service the car.

I learn a lot from your hard work and I appreciate the posts.

Mike D.
Old 05-20-2019, 06:27 AM
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This was also just mentioned in another thread (https://www.jaguarforums.com/forum/x...sensor-217919/), the plastic coolant housings on these engines are known to deteriorate internally. When this happens hot engine coolant recirculates back through the block instead of going into the radiator. Only way to tell is to pull the thermostat and visually inspect. These housings only last about 50k miles.
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